Tread for pneumatic tires.



A. H. SHOEMAKER.

TREAD FOR PNEUMATIC TIRES.

APPLICATION FILED APR. 8, 1911.

Patented Jan. 16, 1912.

'IN l/EN fol? A [b ah/i571 oe ma/ier' WITNESSES:

A m/m/Ey To all whoih it may concern: v I Be it known that I, ALVIN H, SHOEMAKE5, a citizen of the' Un ited States, and a'resl-x flpeciii'catiozi of Letters Patent.

. Patented J an. 16, 1912.

a lication fi1ed Apfii '8, 191 1.' smar no. 819,851.

- dent of Portland, county of jMult-noinah,

'terial set up edgewise, that is, I of the strips perpendicular toj andatlie strips arranged diagonally across the body of the mount said strips on a cnshi'om-o casing, and place layers and State of -Oregon, have invented a new and useful Improvement ingTrads for. :b

Pneumatic Tires, of a specification. I p I p,

My invention relates to pneumatic itiresofvehicles and has durable, inexpensive tread, which also which the fel as-ins s possesses the non-skidding property. -To at make the. treadgpf my.

tain these objects, I Y wheel of a plurality of strips of su table ma with 'the warp tire so as to attain greaterxweark" Iialso '.elastic of the of elastic material intermediateof said strips; the cushion and material, cemented to the 'exterior intermediate layers being preferably of rubher. And finally I vulcanize the tread on the tire into a homogeneous body. The cushion at the juncture between the base of the strips and the casing, andlikewise the elastic intermediate layers, are necessary for preventing the strips of the composite tread from pulling loose from from each other.

In other words, the described construction is necessary to renderthe composite tread pliable and flexible, but

will be able to accommodate themselves to the contortions of the inflated wheel tire'as a whole, while in service and supporting the load of the vehicle.

In the accompanying tuting a part of this specification: Figure 1 is a vertical section of my improved tire, also showing a portion thereof in perspective; Fig. 2- is a partial top view of my tire as it appears in practice, except that, of course, the intermediate now show as prominently as represented; Fig. 3 is a vertical section on line A-B of Fig. 1; and Fig. 4 is a diagrammatic top view illustrating the mode in which the diagonally arranged strips, of which my tread is composed, are cut, so as, to adapt such strips to my particular purpose, and

also with reference to economy with regard to the material out'of which the strips are cut. I

a'enient fabric. --iment on the exterlor, and it is then covered for its .object tu btain a also preferably of pure rubber c.

the casing and drawings cons ielastic layers would tendency to neutralize of the tread at any point The casing, a,-inay be of any common con- Itis coated with rubber cew1th"a composi te tread, "comprising a pluraiityof strips, 6, 6, preferably cut out of elting' composed of fabric impregnated with rubber. The strips, 6,1), are conveniently madeby-a' knife cutting the arc of a Cl-ljClQ-WhOSi-B center is moved equal distances alongthe longitudinal center of the belt strip,,as. illustrated in Fig. 4:, the broken lines, (1, d, designating the radii of the are described by the knife while cutting the strips. Thestrips, b, b, are preferably cut out of belting. By belting I mean the material commonly used for making machine belts. The strips are cut out .of the flat surface of the belting, but when they are appliedto the casing or body of the tire they are turned on an end,so as to bring the warp perpendicular to .the casing.

n the exterior-of the casing, a, is provided a peripheral cushion 6, preferably of pure rubber, and'between the strips, 6, b, are interposed layers of yielding material,

and layers of the composite tread are cemented together and the composite tread and cushion are cemented on the casing; and finally the composite tire is vulcanized into a homogeneous body. The purpose of arranging the strips on an end, that is to say, so as to bring the warp perpendicular to the casing, is to obtain a tread surface that vwill=not-'skid. By'following the mode described for cutting the strips, there is no waste of material and the tread, when finished, has its greatest thickness where subjected to the hardest tapers down at, the sides to the case. I prefer also to face the portions, f, f, of the sides of the tire with pure rubber,

as: shown more clearly in-Fig. 1. B arat the point wear and it underlying ranging the strips, 6, b, diagonally the nonskidding property of my tread is increased. The same arrangement, furthermore, has a any stripping of the strips one from the other, sincethe impact with the ground would deliver more of a glancing blow against the strips instead of a direct blow.

he same arrangement of my stripsalso increases their length, and hence gives a greater area to their abutting cemented sidefaces, and in so doing gives to such cemented side-faces greater power to withstand the stress tending to pull them apart. The functions of the cushion base 6 and of the intermediate elastic layers a have already been described. The elastic strip, f, at both sides of the tire prevents the stripping of the extremities of the bottom edges of the strips, 2), b, from the sides of the casing or body of the tire.

I claim:

A pneumatic tire comprising a body portion provided on its outer surface with a pcripheral layer of rubber, a plurality ofalternate strips of fabric and rubber beyond the layer of rubber on the body portion,

each layer of fabric and rubber being cres- Goples of this patent may be obtained for cent shape and arranged perpendicular to i and diagonally across the peripheral layer of rubber ,on the body portion; the outer edges of the crescent shape strips of fabric forming with the alternate strips of rubber a crescent shape tread, and the strips of rubber between the fabric merging into and forming part of the layer of rubber on the body portion, the ends of said strips of rubber being elongated and merging into and forming a part of the side portions of said v peripheral layer of rubber on the body portion. r

ALVIN H. SHOEMAKER. Witnesses:

CEoIL' LONG, W. LEWIS Coor.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

